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Gamma-Ray Constraint on Galactic Positron Production by MeV Dark Matter

Bertone, Gianfranco; Beacom, John F.; Bell, Nicole F.

The Galactic positrons, as observed by their annihilation gamma-ray line at 0.511 MeV, are difficult to account for with astrophysical sources. It has been proposed that they are produced instead by dark matter annihilation or decay in the inner Galactic halo. To avoid other constraints, these processes are required to occur “invisibly,” such that…